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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bc720154da4a085517e4baa8aab417ad5a5e0dc14de0154b05074a899ea623' 
  AND token = 'Jy2Ut4BBaOfE3Qq5nnVIDJMN33n3zpmulolotCS2jkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables